CN107819519A - Measuring method, the device and system of residual DC component - Google Patents
Measuring method, the device and system of residual DC component Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0799—Monitoring line transmitter or line receiver equipment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6162—Compensation of polarization related effects, e.g., PMD, PDL
Abstract
The embodiment of the present invention provides a kind of measuring method, the device and system of residual DC component, and the measuring method of the residual DC component includes：The data of one section of first predetermined length are intercepted from reception signal；FFT is carried out to the data of the interception, obtains the frequency-region signal of the data；Calculate the power spectrum of the frequency-region signal of the data after conversion；And the peak-peak of the power spectrum is found out in frequency deviation region, the power using the power of the peak-peak as the residual DC component.By the embodiment of the present invention, the residual DC component of optical sender can be measured in the receiving terminal of coherent optical communication system, so as to avoid the diagnostic error of communication network, improves the performance of communication system.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of measuring method of the residual DC component of optical sender,
Device and system.
Background technology
In optical communication system, direct current (DC, direct-current) component of optical sender passes through transmission link and light
After receiver processing, final signal can be recovered and communication quality causes larger cost.With traffic rate raising and
The complication of network state, the influence of this cost become more and more prominent.
In the prior art, can be by the biasing of flexible configuration coherent transmitter modulator, to reduce light as much as possible
The DC component of emitter, so as to reduce the influence of the DC component of optical sender (bibliography 1).However, no matter using assorted
The emitter collocation method of sample, residual DC component are constantly present, on the one hand, cause the deterioration of communication quality, on the other hand,
Because the size of optical sender residual DC component is unknown, therefore, in the monitoring and diagnosis of communication network, may produce
Raw diagnostic error, so as to cause strain scheme improper, influences the performance of communication system.
Bibliography 1：US20140308047A1
It should be noted that the introduction to technical background above be intended merely to it is convenient technical scheme is carried out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Can not merely because these schemes the present invention
Background section is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.
The content of the invention
Inventor has found during the present invention is realized, because the size of the residual DC component of optical sender is unknown
, therefore, it may cause the diagnostic error of communication network in the residual DC component that optical receiving end receives, influence communication system
Performance.
In order to solve the above problems, this application provides a kind of measuring method of the residual DC component of optical sender, dress
Put and system.
First aspect according to embodiments of the present invention, there is provided a kind of measuring method of residual DC component, applied to list
The optical communication system of polarization, wherein, methods described includes：The data of one section of first predetermined length are intercepted from reception signal；It is right
The data of the interception carry out FFT, obtain the frequency-region signal of the data；Calculate the data after conversion
Frequency-region signal power spectrum；And the peak-peak of the power spectrum is found out in frequency deviation region, by the peak-peak
Power of the power as the residual DC component.
Second aspect according to embodiments of the present invention, there is provided a kind of measuring method of residual DC component, applied to double
The optical communication system of polarization, wherein, methods described includes：Intercepted respectively from the reception signal of two polarization states one section first it is pre-
The data of measured length；FFT is carried out to two segment datas of the interception, obtains the frequency-region signal of each data；Calculate
The power spectrum of the frequency-region signal of each data after conversion, and calculate two power spectrum are added；And in frequency deviation region
Find out the peak-peak of the power spectrum after being added, the power using the power of the peak-peak as the residual DC component
With.
The third aspect according to embodiments of the present invention, there is provided a kind of measuring method of residual DC component, applied to double
The optical communication system of polarization, wherein, methods described includes：Measure two polarization states on residual DC component power and；Survey
Measure the difference power of the residual DC component in two polarization states；And sent out according to the power and with the difference power, calculating light
The power for the residual DC component penetrated in each polarization state of machine.
Fourth aspect according to embodiments of the present invention, there is provided a kind of measurement apparatus of residual DC component, applied to list
The optical communication system of polarization, wherein, described device includes：Interception unit, it intercepts one section of first pre- fixed length from reception signal
The data of degree；Converter unit, its data intercepted to the interception unit carry out FFT, obtain the data
Frequency-region signal；Computing unit, it calculates the power spectrum of the frequency-region signal of the data after the converter unit conversion；And really
Order member, it finds out the peak-peak of the power spectrum in frequency deviation region, using the power of the peak-peak as described residual
The power of remaining DC component.
5th aspect according to embodiments of the present invention, there is provided a kind of measurement apparatus of residual DC component, applied to double
The optical communication system of polarization, wherein, described device includes：Interception unit, it distinguishes from the reception signal in two polarization states
Intercept the data of one section of first predetermined length；Converter unit, its two segment data intercepted to the interception unit carry out quick Fu
Vertical leaf transformation, obtains the frequency-region signal of each data；Computing unit, it calculates the frequency domain of each data after the converter unit conversion
The power spectrum of signal, and calculate two power spectrum are added；And determining unit, after it finds out addition in frequency deviation region
Power spectrum peak-peak, using the power of the peak-peak as the residual DC component power and.
6th aspect according to embodiments of the present invention, there is provided a kind of measurement apparatus of residual DC component, applied to double
The optical communication system of polarization, wherein, described device includes：First measuring unit, it measures the residual DC in two polarization states
The power of component and；Second measuring unit, it measures the difference power of the residual DC component in two polarization states；And calculate single
Member, its power measured according to first measuring unit and the difference power with second measuring unit measurement, calculate light hair
The power for the residual DC component penetrated in each polarization state of machine.
The 7th aspect according to embodiments of the present invention, there is provided a kind of receiver, the receiver includes the foregoing 4th,
5th, the device described in six any one of aspect.
Eighth aspect according to embodiments of the present invention, there is provided a kind of optical communication system, wherein, the optical communication system bag
Transmitter and receiver is included, and the optical communication system also includes the device described in foregoing fourth, fifth, six any one of aspect.
The beneficial effects of the present invention are：By the embodiment of the present invention, light can be measured in the receiving terminal of optical communication system
The residual DC component of emitter, so as to avoid the diagnostic error of communication network, improve the performance of communication system.And by
Receiving terminal measures to residual DC component, will not change the topological sum software and hardware configuration of existing network, and suitable for appointing
The coherent optical communication system of meaning modulation format.
With reference to following explanation and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, specifies the original of the present invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in scope.In appended power
In the range of the spirit and terms that profit requires, embodiments of the present invention include many changes, modifications and are equal.
The feature for describing and/or showing for a kind of embodiment can be in a manner of same or similar one or more
Used in individual other embodiment, it is combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more further features, one integral piece, step or component.
Brief description of the drawings
Included accompanying drawing is used for providing being further understood from the embodiment of the present invention, which constitutes one of specification
Point, for illustrating embodiments of the present invention, and the principle for the explaination present invention that comes together with word description.Under it should be evident that
Accompanying drawing in the description of face is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying wound
On the premise of the property made is laborious, other accompanying drawings can also be obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is the schematic diagram of the coherent optical communication system 100 singly polarized；
Fig. 2 is the flow chart of the measuring method of the residual DC component of the embodiment of the present invention 1；
Fig. 3 is the schematic diagram of the coherent optical communication system 300 of dual-polarization；
Fig. 4 is the flow chart of the measuring method of the residual DC component of the embodiment of the present invention 2；
Fig. 5 is the flow chart of the measuring method of the residual DC component of the embodiment of the present invention 3；
Fig. 6 is the composition schematic diagram of the measurement apparatus 600 of the residual DC component of the embodiment of the present invention 4；
Fig. 7 is the composition schematic diagram of the measurement apparatus 700 of the residual DC component of the embodiment of the present invention 5；
Fig. 8 is the composition schematic diagram of the measurement apparatus 800 of the residual DC component of the embodiment of the present invention 6；
Fig. 9 is the schematic diagram of an embodiment of the receiver of the present embodiment 7；
Figure 10 is the schematic diagram of another embodiment of the receiver of the present embodiment 7；And
Figure 11 is the composition schematic diagram of the optical communication system of the embodiment of the present invention 8.
Embodiment
Referring to the drawings, will be apparent by following specification, foregoing and further feature of the invention.In specification
In accompanying drawing, only certain exemplary embodiments of this invention is specifically disclosed, which show the portion for the principle that can wherein use the present invention
Divide embodiment, it will thus be appreciated that the invention is not restricted to described embodiment, on the contrary, the present invention includes falling into appended power
Whole modification, modification and equivalents in the range of profit requirement.
, should the embodiments of the invention provide measuring method, the device and system of a kind of residual DC component of optical sender
Method is by analyzing the signal that photoreceiver receives, to measure the residual DC component in optical sender.Due to this
Method measures in receiving terminal to residual DC component, will not change the topological sum software and hardware configuration of existing network, also just not
Extra influence can be caused to existing communication system, and this method is applied to the coherent optical communication system of any modulation format,
Such as phase-shift keying (PSK) (PSK, Phase Shift Keying), quadrature amplitude modulation (QAM, Quadrature Amplitude
Modulation) etc..
The various embodiments of the embodiment of the present invention are illustrated below in conjunction with the accompanying drawings.These embodiments are example
Property, it is not the limitation to the embodiment of the present invention.
Embodiment 1
A kind of measuring method of residual DC component is present embodiments provided, the coherent light that this method is applied to singly polarize leads to
Letter system.
Fig. 1 is the schematic diagram of the coherent optical communication system 100 singly polarized, as shown in figure 1, the coherent optical communication system 100
Including optical sender 101, photoreceiver 103 and transmission link 102.Wherein, the optical sender 101 includes output single polarization
The devices such as the laser 104 of signal, I/Q modulator 105, PM couplers 106.Because the hardware of optical sender 101 or configuration are paid no attention to
Think, the signal after the modulation of I/Q modulator 105 includes residual DC component, and includes the optical signal of the residual DC component
Received by transmission link 102 by photoreceiver 103.Photoreceiver 103 is received in receiving terminal by the method for the present embodiment
To signal handled, the residual DC component can be measured and then for carrying out the analysis of bit error performance etc., improved
Systematic function.
Fig. 2 is the flow chart of the measuring method of the residual DC component of the present embodiment, as shown in Fig. 2 this method includes：
Step 201：The data of one section of first predetermined length are intercepted from reception signal；
Step 202：FFT is carried out to the data of the interception, obtains the frequency-region signal of the data；
Step 203：Calculate the power spectrum of the frequency-region signal of the data after conversion；And
Step 204：The peak-peak of the power spectrum is found out in frequency deviation region, using the power of the peak-peak as
The power of the residual DC component.
The present embodiment looks for the power of the method measurement remnant DC component of maximum peak by frequency domain, due to being entered in receiving terminal
Row measurement, without changing the topological sum software and hardware configuration of network, extra influence will not be caused to existing optical communication system, is passed through
The method of the present embodiment measures the power of residual DC component, you can applied to the analysis of bit error performance etc., improves system
Performance.
In step 201, the data of one section of first predetermined length, reception signal here can be intercepted from reception signal
Received from photoreceiver, at the selection of the first predetermined length here and the size of phase noise and subsequent frequency-domain
The resolution ratio of reason is relevant, it is desirable to which its size is suitable.For example, first predetermined length can not be too big, it is necessary to be less than optical communication system
Phase noise period of change, but first predetermined length can not be too small, it is necessary to ensure enough spectral resolutions,
That is, the selection of first predetermined length needs to ensure frequency domain resolution in certain scope.For example, it is for character rate
30G optical communication system, the selection of first predetermined length need to ensure value of the spectral resolution between 1MHz and 100MHz.
In step 202, FFT can be carried out to the data of interception, to obtain the frequency domain of data letter
Number.Specific transform method is referred to prior art, and here is omitted.
In step 203 and step 204, the power spectrum of above-mentioned frequency-region signal can be calculated, and is found in frequency deviation region
The peak-peak of the power spectrum, the power using its power as the residual DC component.
In the present embodiment, the method for the power spectrum to calculating above-mentioned frequency-region signal is not limited, and may be referred to existing skill
Art.
In the present embodiment, frequency deviation region refers to the difference on the frequency of local oscillator laser and carrier wave laser in coherent optical communication system
Scope, its empirical value are, such as 0Hz to 1GHz.
In the present embodiment, the method that the peak-peak of power spectrum is found in frequency deviation region may be referred to prior art,
Here is omitted.
In the present embodiment, the power of above-mentioned peak-peak is the power of the residual DC component, can be expressed as：
Pa=PX,N1(f0)
Wherein, X is above-mentioned reception signal, and N1 is above-mentioned first predetermined length, and f0 is the frequency at above-mentioned peak-peak.
By the measuring method of the embodiment of the present invention, light can be measured in the receiving terminal of the coherent optical communication system singly polarized
The power of the residual DC component of emitter, so that the power of the residual DC component by assessing the emitter is to transmission error code
Performance influences, the performance change of communication network is diagnosed and adjusted, to avoid the diagnostic error of communication network, carry
The performance of high communication system.And this method measurement remnant DC component is utilized, will not only change the topological sum of existing network
Software and hardware configuration, apply also for the coherent optical communication system of any modulation format.
Embodiment 2
A kind of measuring method of residual DC component is present embodiments provided, the coherent light that this method is applied to dual-polarization leads to
Letter system.
Fig. 3 is the schematic diagram of the coherent optical communication system 300 of dual-polarization, as shown in figure 3, the coherent optical communication system 300
Including optical sender 301, photoreceiver 303 and transmission link 302.Wherein, the optical sender 301 includes output double polarizing light
The devices such as the laser 304 of signal, I/Q modulator 305, PM couplers 306.Because the hardware of optical sender 301 or configuration are paid no attention to
To think, the signal after the modulation of I/Q modulator 305 is included in the residual DC component on horizontal state of polarization and perpendicular polarisation state, and
And the optical signal comprising the residual DC component is received by transmission link 302 by photoreceiver 303.Pass through the side of the present embodiment
Method is handled in the signal that receiving terminal receives to photoreceiver 303, can be measured the residual DC component and then is used for
The analysis of bit error performance etc. is carried out, improves systematic function.
Fig. 4 is the flow chart of the measuring method of the residual DC component of the present embodiment, as shown in figure 4, this method includes：
Step 401：Intercept the data of one section of first predetermined length respectively from the reception signal of two polarization states；
Step 402：FFT is carried out to two segment datas of the interception, obtains the frequency-region signal of each data；
Step 403：The power spectrum of the frequency-region signal of each data after conversion is calculated, and by calculate two power spectrum phases
Add；And
Step 404：The peak-peak of the power spectrum after being added is found out in frequency deviation region, by the power of the peak-peak
As the residual DC component power and.
The present embodiment looked for by frequency domain the method measurement remnant DC component of maximum peak power and.Due to being in receiving terminal
Measure, without changing the topological sum software and hardware configuration of network, extra influence will not be caused to existing optical communication system, is led to
Cross the present embodiment method measure residual DC component power and, you can applied to the analysis of bit error performance etc., improve
Systematic function.
In step 401, the number of one section of first predetermined length can be intercepted respectively from the reception signal of two polarization states
According to two polarization states here refer to horizontal state of polarization and perpendicular polarisation state, and the reception signal of two polarization states is from light here
Received on receiver.
In step 402, FFT can be carried out respectively to two segment datas of interception, to obtain each data
Frequency-region signal.
Above-mentioned steps 401-402 differs only in the step 201-202's in embodiment 1：Step in embodiment 1
201-202 only relates to that the reception signal singly polarized is intercepted and converted, and is related in step 401-402 to two polarization states
Reception signal intercepted and converted respectively.Selection and specific transform method on the first predetermined length, with implementation
Example 1 is identical, and here is omitted.
In step 403-404, the power spectrum of the frequency-region signal of each data can be calculated, and by calculate two power
Spectrum is added, and the power spectrum after being added, then, the peak-peak of the power spectrum after the addition is found in frequency deviation region, will
Its power as the residual DC component power and.
In the present embodiment, work(is found on the method for the power spectrum that calculates above-mentioned frequency-region signal and in frequency deviation region
The method of the peak-peak of rate spectrum, it is same as Example 1, prior art can be referred to, here is omitted.
In the present embodiment, the power P a of above-mentioned peak-peak can be expressed as：
Pa=PXY,N1(f0)
Wherein, X, Y are the reception signal of above-mentioned two polarization state, and N1 is above-mentioned first predetermined length, and f0 is above-mentioned maximum
Frequency at peak value.
In the present embodiment, can be using the power P a of above-mentioned peak-peak as the residual DC component on horizontal state of polarization
Power mdHWith the power md of the residual DC component on perpendicular polarisation stateVPower and, that is, Pa=mdH+mdV。
In the present embodiment, obtained residual DC component of the optical sender in two polarization states power and, you can
The power of the residual DC component in the optical sender in two polarization states is obtained by existing means, the present embodiment is to specific
Means are not restricted.For example, the residual DC component in the optical sender in two polarization states can be obtained by existing means
Difference power, and, finally give the power of the residual DC component in the optical sender in two polarization states in conjunction with the power.
By the measuring method of the embodiment of the present invention, optical sender can be measured in the receiving terminal of coherent optical communication system
The power of residual DC component in two polarization states, so that the power of the residual DC component by assessing the emitter is to passing
The diagnosis for influenceing, the performance change of communication network is diagnosed and adjusted, to avoid communication network of defeated error performance is wrong
By mistake, the performance of communication system is improved.And the measuring method measurement remnant DC component is utilized, will not only change existing network
Topological sum software and hardware configuration, apply also for the coherent optical communication system of any modulation format.
Embodiment 3
A kind of measuring method of residual DC component is present embodiments provided, the measuring method is applied to as shown in Figure 3
Dual-polarization coherent optical communication system 300.The letter received by the method for the present embodiment in receiving terminal to photoreceiver 303
Number handled, the residual DC component and then the analysis for carrying out bit error performance etc. can be measured, improve systematicness
Energy.
Fig. 5 is the schematic diagram of the measuring method of the residual DC component of the present embodiment, as shown in figure 5, this method includes：
Step 501：Measure two polarization states on residual DC component power and；
Step 502：Measure the difference power of the residual DC component in two polarization states；And
Step 503：According to the power and with the difference power, calculate the residual DC in each polarization state of optical sender
The power of component.
In the present embodiment, step 501 can realize that its content is incorporated in this, herein by the method for embodiment 2
Repeat no more.
In the present embodiment, step 502 is referred to prior art, and here is omitted.
In step 503, obtained on the power and Pa and two polarization state of the residual DC component in two polarization states
Residual DC component difference power Pb, you can obtain the power of the residual DC component on the horizontal state of polarization of optical sender
mdHWith the power md of the residual DC component on perpendicular polarisation stateV, it is expressed as：
By the measuring method of the embodiment of the present invention, optical sender is measured according to the receiving terminal in coherent optical communication system
The power of residual DC component in two polarization states and and difference power, the work(of the residual DC component of optical sender can be measured
Rate, so as to avoid the diagnostic error of communication network by subsequent treatment, improve the performance of communication system.And utilize the measurement side
It method measurement remnant DC component, will not only change the topological sum software and hardware configuration of existing network, apply also for any modulation lattice
The coherent optical communication system of formula.
The method of the residual DC component of measurand transmitter is done above by embodiment 1, embodiment 2 and embodiment 3
Illustrate, obtained the power of the residual DC component of emitter, the power of signal and residual DC component can also be calculated accordingly
Ratio, because the ratio is related to transmission characteristic, it is possible thereby to which measurement and analysis applied to bit error performance etc., improves system
Performance.
By taking double polarizing light communication system as an example, in the present embodiment, the signal power in two polarization states can also be measuredWithAnd based on the power of the residual DC component in above-mentioned two polarization state, obtain signal and residual DC component
The ratio of power.
In the present embodiment, the ratio R of above-mentioned signal and the power of residual DC componentH、RVIt can be expressed as：
Wherein,For the power of the signal on horizontal state of polarization,For the power of the signal on perpendicular polarisation state, mdH
For the power of the residual DC component on horizontal state of polarization, and mdVFor the power of the residual DC component on perpendicular polarisation state.
In the present embodiment, the resultant signal on above-mentioned two polarization state can with the power ratio R of total residual DC component
To be expressed as：
The present embodiment is to the signal power in two polarization states of measurementWithMethod be not restricted, can use existing
There are means, here is omitted.
Embodiment 4
A kind of measurement apparatus of residual DC component is present embodiments provided, applied to the phase singly polarized as shown in Figure 1
Dry optical communication system 100.It is similar with the method for embodiment 1 to solve the principle of problem due to the device, therefore its specific implementation
The implementation of the method for embodiment 1 is may be referred to, content something in common is not repeated to illustrate.
Fig. 6 is the schematic diagram of the measurement apparatus of the residual DC component of the present embodiment, as shown in fig. 6, the device 600 wraps
Include：
Interception unit 601, it intercepts the data of one section of first predetermined length from reception signal；
Converter unit 602, its data intercepted to the interception unit 601 carry out FFT, obtain described
The frequency-region signal of data；
Computing unit 603, it calculates the power spectrum of the frequency-region signal of the data after the converter unit 602 converts；
And
Determining unit 604, it finds out the peak-peak of the power spectrum in frequency deviation region, by the work(of the peak-peak
Power of the rate as the residual DC component.
In the present embodiment, as it was previously stated, the selection principle of first predetermined length is：First predetermined length is less than
The period of change of the phase noise of the optical communication system, and the selection of first predetermined length ensures that spectral resolution exists
In certain limit.
By the measurement apparatus of the embodiment of the present invention, light can be measured in the receiving terminal of the coherent optical communication system singly polarized
The power of the residual DC component of emitter, so that the power of the residual DC component by assessing the emitter is to transmission error code
Performance influences, the performance change of communication network is diagnosed and adjusted, to avoid the diagnostic error of communication network, carry
The performance of high communication system.And the measurement device residual DC component is utilized, will not only change the topological sum of existing network
Software and hardware configuration, apply also for the coherent optical communication system of any modulation format.
Embodiment 5
Present embodiments provide a kind of measurement apparatus of residual DC component, the phase applied to dual-polarization as shown in Figure 3
Dry optical communication system 300.It is similar with the method for embodiment 2 to solve the principle of problem due to the device, therefore its specific implementation
The implementation of the method for embodiment 2 is may be referred to, content something in common is not repeated to illustrate.
Fig. 7 is the schematic diagram of the measurement apparatus of the residual DC component of the present embodiment, as shown in fig. 7, the device 700 wraps
Include：
Interception unit 701, it intercepts the number of one section of first predetermined length respectively from the reception signal in two polarization states
According to；
Converter unit 702, its two segment data intercepted to the interception unit 701 carry out FFT, obtained
The frequency-region signal of each data；
Computing unit 703, it calculates the power spectrum of the frequency-region signal of each data after the converter unit 702 converts, and
Calculate two power spectrum are added；And
Determining unit 704, it finds out the peak-peak of the power spectrum after being added in frequency deviation region, by the peak-peak
Power as the residual DC component power and.
In the present embodiment, as it was previously stated, the selection principle of first predetermined length is：First predetermined length is less than
The period of change of the phase noise of the optical communication system, and the selection of first predetermined length ensures that spectral resolution exists
In certain limit.
In the present embodiment, as it was previously stated, having obtained the residual DC component in the optical sender in two polarization states
Power and, you can obtain the power of the residual DC component in the optical sender in two polarization states by existing means, so as to
Transmission error code performance is influenceed to become to the performance of communication network by the power for the residual DC component for assessing the emitter
Change is diagnosed and adjusted, and can be avoided the diagnostic error of communication network, be improved the performance of communication system.And utilize the device
Measurement remnant DC component, it will not only change the topological sum software and hardware configuration of existing network, apply also for any modulation format
Coherent optical communication system.
Embodiment 6
A kind of measurement apparatus of residual DC component is present embodiments provided, applied to dual-polarization as shown in Figure 3
Coherent optical communication system 300.It is similar with the method for embodiment 3 to solve the principle of problem due to the device, therefore it is specific real
The implementation for the method that may be referred to embodiment 3 is applied, content something in common is not repeated to illustrate.
Fig. 8 is the schematic diagram of the measurement apparatus of the residual DC component of the present embodiment, as shown in figure 8, the device 800 wraps
Include：
First measuring unit 801, its measure two polarization states on residual DC component power and；
Second measuring unit 802, it measures the difference power of the residual DC component in two polarization states；And
Computing unit 803, its power measured according to first measuring unit 801 and with second measuring unit
The difference power of 802 measurements, calculate the power of the residual DC component in each polarization state of optical sender.
In the present embodiment, first measuring unit 801 can pass through the measurement apparatus of the residual DC component of embodiment 5
700 realize, that is, first measuring unit 801 can include (not shown)：Interception unit, its from it is described two partially
The data of one section of first predetermined length are intercepted in reception signal in polarization state respectively；Converter unit, it cuts to the interception unit
Two segment datas taken carry out FFT, obtain the frequency-region signal of each data；Computing unit, it is single that it calculates the conversion
The power spectrum of the frequency-region signal of each data after member conversion, and calculate two power spectrum are added；And determining unit, its
The peak-peak of the power spectrum after being added is found out in frequency deviation region, using the power of the peak-peak as the residual DC
The power of component and.
In the present embodiment, the method for measuring second measuring unit 802 above-mentioned difference power is not restricted, and may be referred to
Prior art, here is omitted.
In the present embodiment, the embodiment of the computing unit 803 is identical with the step 503 in embodiment 3, herein
Repeat no more.
In the present embodiment, the power of the residual DC component in two polarization states of optical sender has been obtained, can be with
Calculate the ratio of signal and the power of residual DC component.Because the ratio is related to transmission characteristic, it is possible thereby to applied to mistake
Measurement and analysis of code characteristic etc., improve systematic function.Wherein, the ratio of signal and the power of residual DC component is to pass through
Calculate the signal power in two polarization statesWithWith the ratio of the power of the residual DC component in above-mentioned two polarization state
It is worth to, the present embodiment is to the signal power in two polarization statesWithComputational methods be not restricted.
By the measurement apparatus of the embodiment of the present invention, optical sender is measured according to the receiving terminal in coherent optical communication system
The power of residual DC component in two polarization states and and difference power, two polarization states of optical sender can be accurately measured
On residual DC component power, so as to by assess the emitter residual DC component power to transmission error code performance
Influence the performance change of communication network is diagnosed and adjusted, the diagnostic error of communication network can be avoided, improved logical
The performance of letter system.And the measurement device residual DC component is utilized, the topological sum that will not only change existing network is soft or hard
Part configures, and applies also for the coherent optical communication system of any modulation format.
Embodiment 7
A kind of receiver is present embodiments provided, as shown in figure 9, the receiver 900 can include appointing in embodiment 4,5,6
The measurement apparatus of residual DC component described in one.Due in embodiment 4 into embodiment 6, to residual DC component
Measurement apparatus 600, the measurement apparatus 800 of the measurement apparatus 700 of residual DC component and residual DC component done specifically
Bright, its content is incorporated in this, and here is omitted.
Figure 10 is the schematic block diagram that the system of the receiver of the embodiment of the present invention is formed, and is applied to dual-polarization with the receiver
Coherent optical communication system exemplified by.As shown in Figure 10, receiver 1000 includes：
Front end, its effect is the baseband signal in two polarization states of the optical signal person of being converted to by input, of the invention real
Apply in example, two polarization states can include H polarization states and V polarization states.
As shown in Figure 10, the front end includes：Local oscillator laser 1010, optical mixer unit (Optical 90deg hybrid)
1001st, photoelectric detector (O/E) 1002,1004,1006 and 1008, digital analog converter (ADC) 1003,1005,1007 and 1009,
The measurement apparatus 1011 of dispersion compensator 1012, balanced device 1013 and residual DC component, wherein, the survey of residual DC component
The structure of amount device 1011 is identical with the record in embodiment 5 or embodiment 6 with function, and here is omitted；Local oscillator laser
Device 1010 is used to provide local light source, and optical signal is through optical mixer unit (Optical 90deg hybrid) 1001, photoelectric detector
(O/E) 1002 and 1004, digital analog converter (ADC) 1003 and 1005 be converted to baseband signal in a polarization state；The light is believed
Number through optical mixer unit (Optical 90deg hybrid) 1001, photoelectric detector (O/E) 1006 and 1008, digital analog converter
(ADC) 1007 and 1009 the baseband signal in another polarization state is converted to；Its detailed process similarly to the prior art, herein not
Repeat again.
In addition, if the estimation of frequency difference and phase noise to OSNR has an impact, frequency difference can also be included in receiver 1000
Compensator and phase noise compensation device (not shown).Also, Figure 10 composition of receiver 1000 is simply illustrated, specific real
During applying, some parts can also be increased as needed or reduce some parts.
By photoreceiver provided in an embodiment of the present invention, can be accurately measured in the receiving terminal of coherent optical communication system
The residual DC component of optical sender, so as to avoid the diagnostic error of communication network, improve the performance of communication system.And utilize
It the photoreceiver measurement remnant DC component, will not only change the topological sum software and hardware configuration of existing network, apply also for appointing
The coherent optical communication system of meaning modulation format.
Embodiment 8
The present embodiment additionally provides a kind of optical communication system, and Figure 11 is the structural representation of the optical communication system of the present embodiment
Figure, as shown in figure 11, it is straight that optical communication system 1100 includes emitter 1101, transmission link 1102, receiver 1103 and remnants
The measurement apparatus 1104 of flow component.
In the present embodiment, the structure of the measurement apparatus 1104 of residual DC component and function and in embodiment 4,5,6
The record of one is identical, and here is omitted.
In the present embodiment, the measurement apparatus 1104 of residual DC component can also be integrated into photoreceiver 1103, made
For a module of photoreceiver 1103.
In the present embodiment, emitter 1101 and transmission link 1102 can have the structure and work(of existing transmission link
Can, the embodiment of the present invention is not limited the 26S Proteasome Structure and Function of emitter and transmission link.
By the optical communication system of the embodiment of the present invention, the residual of optical sender can be measured in the receiving terminal of optical communication system
Remaining DC component, so as to avoid the diagnostic error of communication network, improve the performance of communication system.And utilize the coherent light communication
Systematic survey residual DC component, it will not only change the topological sum software and hardware configuration of existing network, apply also for any modulation
The coherent optical communication system of form.
The embodiment of the present invention also provides a kind of computer-readable program, wherein when performing described program in receivers,
Described program causes the photoreceiver to perform the method any one of embodiment 1 to embodiment 3.
The embodiment of the present invention also provides a kind of storage medium for being stored with computer-readable program, wherein the computer can
Reader causes photoreceiver to perform the method any one of embodiment 1 to embodiment 3.
Apparatus and method more than of the invention can be realized by hardware, can also be realized by combination of hardware software.The present invention
It is related to such computer-readable program, when the program is performed by logical block, can realizes the logical block above
Described device or component parts, or the logical block is realized various methods or step described above.The invention further relates to
For storing the storage medium of procedure above, such as hard disk, disk, CD, DVD, flash memory.
Above in association with specific embodiment, invention has been described, it will be appreciated by those skilled in the art that this
A little descriptions are all exemplary, are not limiting the scope of the invention.Those skilled in the art can be according to the present invention
Spirit and principle various variants and modifications are made to the present invention, these variants and modifications are also within the scope of the invention.
Claims (10)
1. a kind of measurement apparatus of residual DC component, applied to the optical communication system singly polarized, wherein, the measurement apparatus bag
Include：
Interception unit, it intercepts the data of one section of first predetermined length from reception signal；
Converter unit, its data intercepted to the interception unit carry out FFT, obtain the frequency domain of the data
Signal；
Computing unit, it calculates the power spectrum of the frequency-region signal of the data after the converter unit conversion；And
Determining unit, it finds out the peak-peak of the power spectrum in frequency deviation region, using the power of the peak-peak as
The power of the residual DC component.
2. measurement apparatus according to claim 1, wherein, the selection principle of first predetermined length is：Described first
Predetermined length is less than the period of change of the phase noise of the optical communication system, and the selection of first predetermined length ensures
Spectral resolution is within the specific limits.
3. measurement apparatus according to claim 1, wherein, the power of the peak-peak is expressed as：
Pa=PX,N1(f0)
Wherein, X is the reception signal, and N1 is first predetermined length, and f0 is the frequency at the peak-peak.
4. a kind of measurement apparatus of residual DC component, applied to the optical communication system of dual-polarization, wherein, the measurement apparatus bag
Include：
Interception unit, it intercepts the data of one section of first predetermined length respectively from the reception signal in two polarization states；
Converter unit, its two segment data intercepted to the interception unit carry out FFT, obtain the frequency of each data
Domain signal；
Computing unit, it calculates the power spectrum of the frequency-region signal of each data after the conversion of described converter unit, and will calculate
Two power spectrum are added；And
Determining unit, it finds out the peak-peak of the power spectrum after being added in frequency deviation region, by the power of the peak-peak
As the residual DC component power and.
5. measurement apparatus according to claim 4, wherein, the selection principle of first predetermined length is：Described first
Predetermined length is less than the period of change of the phase noise of the optical communication system, and the selection of first predetermined length ensures
Spectral resolution is within the specific limits.
6. measurement apparatus according to claim 4, wherein, the power P a of the peak-peak is expressed as：
Pa=PXY,N1(f0)
Wherein, X, Y are the reception signal of described two polarization states, and N1 is first predetermined length, and f0 is the peak-peak
The frequency at place.
7. a kind of measurement apparatus of residual DC component, applied to the optical communication system of dual-polarization, wherein, the measurement apparatus bag
Include：
First measuring unit, its measure two polarization states on residual DC component power and；
Second measuring unit, it measures the difference power of the residual DC component in two polarization states；And
Computing unit, its power measured according to first measuring unit and the power with second measuring unit measurement
Difference, calculate the power of the residual DC component in each polarization state of optical sender.
8. measurement apparatus according to claim 7, wherein, first measuring unit includes：
Interception unit, it intercepts the data of one section of first predetermined length respectively from the reception signal in described two polarization states；
Converter unit, its two segment data intercepted to the interception unit carry out FFT, obtain the frequency of each data
Domain signal；
Computing unit, it calculates the power spectrum of the frequency-region signal of each data after the conversion of described converter unit, and will calculate
Two power spectrum are added；And
Determining unit, it finds out the peak-peak of the power spectrum after being added in frequency deviation region, by the power of the peak-peak
As the residual DC component power and.
9. measurement apparatus according to claim 8, wherein, the selection principle of first predetermined length is：Described first
Predetermined length is less than the period of change of the phase noise of the optical communication system, and the selection of first predetermined length ensures
Spectral resolution is within the specific limits.
10. measurement apparatus according to claim 8, wherein, the power P a of the peak-peak is expressed as：
Pa=PXY,N1(f0)
Wherein, X, Y are the reception signal of described two polarization states, and N1 is first predetermined length, and f0 is the peak-peak
The frequency at place.
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| CN201610822048.XA CN107819519B (en) | 2016-09-13 | 2016-09-13 | Device for measuring residual direct current component |
| US15/664,477 US10177844B2 (en) | 2016-09-13 | 2017-07-31 | Measurement method and apparatus for a residual direct-current component and system |
| JP2017147694A JP6981081B2 (en) | 2016-09-13 | 2017-07-31 | Measurement method, equipment and system of residual DC component |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2517183Y (en) * | 2001-11-27 | 2002-10-16 | 华为技术有限公司 | Optical signal modulation device of optical communication system |
| JP2007208546A (en) * | 2006-01-31 | 2007-08-16 | Fujitsu Ltd | Wavelength dispersion monitoring method, device and optical transmission system |
| US20150255029A1 (en) * | 2014-03-07 | 2015-09-10 | Semiconductor Energy Laboratory Co., Ltd. | Display device, display module including the display device, and electronic device including the display device or the display module |
| US20150280862A1 (en) * | 2014-03-28 | 2015-10-01 | Moshe Teplitsky | Methods and arrangements for direct current estimation of a wireless communication packet |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3401301B2 (en) | 1993-10-13 | 2003-04-28 | ペンタックス株式会社 | Camera image stabilizer |
| US6724387B2 (en) | 2000-12-28 | 2004-04-20 | Fibercontrol | Method and device to calculate and display the phase transformation of optical polarization |
| US8106674B2 (en) | 2006-10-31 | 2012-01-31 | Lc Vision, Llc | Automated liquid crystal analysis instrument |
| JP5651990B2 (en) * | 2010-04-15 | 2015-01-14 | 富士通株式会社 | Digital coherent receiver and receiving method |
| CN102054272B (en) | 2010-11-03 | 2012-06-27 | 浙江大学 | Displacement vector detection method based on joint fractional Fourier transform and device |
| CN103339882B (en) * | 2011-02-01 | 2016-05-11 | 日本电气株式会社 | Coherent optics receiver, for detection of the apparatus and method of the interchannel deflection in coherent optics receiver |
| JP5977211B2 (en) * | 2013-01-30 | 2016-08-24 | 日本電信電話株式会社 | Optical transmission system and signal processing method |
| US9059805B2 (en) | 2013-04-11 | 2015-06-16 | Ciena Corporation | Optimum modulator bias systems and methods in coherent optical transmitters |
| CN104579621B (en) * | 2013-10-15 | 2019-09-13 | 南京中兴新软件有限责任公司 | Clock recovery method and device |
| JP6325738B2 (en) * | 2014-03-27 | 2018-05-16 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Apparatus and method for monitoring optical performance parameters, and optical transmission system |
| JP6442884B2 (en) * | 2014-06-25 | 2018-12-26 | 富士通株式会社 | Optical transmission system, optical transmission device, and wavelength interval measuring device |
| CN105450295B (en) | 2014-07-09 | 2018-09-11 | 富士通株式会社 | Monitor device, transmitter and the communication system of optical signal to noise ratio |
-
2016
- 2016-09-13 CN CN201610822048.XA patent/CN107819519B/en active Active
-
2017
- 2017-07-31 JP JP2017147694A patent/JP6981081B2/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2517183Y (en) * | 2001-11-27 | 2002-10-16 | 华为技术有限公司 | Optical signal modulation device of optical communication system |
| JP2007208546A (en) * | 2006-01-31 | 2007-08-16 | Fujitsu Ltd | Wavelength dispersion monitoring method, device and optical transmission system |
| US20150255029A1 (en) * | 2014-03-07 | 2015-09-10 | Semiconductor Energy Laboratory Co., Ltd. | Display device, display module including the display device, and electronic device including the display device or the display module |
| US20150280862A1 (en) * | 2014-03-28 | 2015-10-01 | Moshe Teplitsky | Methods and arrangements for direct current estimation of a wireless communication packet |
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| CN107819519B (en) | 2020-04-14 |
| US10177844B2 (en) | 2019-01-08 |
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